Reference Circuit Design For Microphone Interfaces - Quectel SC690A Series Hardware Design

4.18.1. Reference Circuit Design for Microphone Interfaces

MIC_BIAS1
MIC1_P
MIC1_M
Module
Figure 24: Reference Circuit Design for ECM Microphone Interfaces
MIC_BIAS3
Module
Figure 25: Reference Circuit Design for MEMS Microphone Interfaces
SC690A_Series_Hardware_Design
R1
2.2 K
C1 D1 D2
100 nF
MIC3_M
C1
33 pF
MIC3_P
R2
2.2 K
C3
C2
33 pF 33 pF
F1
R1
0 R
R2
D1
0 R
C2
C3
33 pF 100 nF
Smart Module Series
R3
0 R
R4
ECM MIC
NM_0 R
1
2
VDD
GND
3
GND
OUT
4
MEMS MIC
D2
72 / 105